As Elsa only has 3 willpower, she is banished A few quick clarifications: Challenges happen one vs one , one at a time Challenging the same card with two or more of yours is OK
Specifically, two other versions of Niv-Mizzet
Keep working on your deck, and aim for a good balance of bombs, removal, card advantage, and mana curve
Some similar cards that I'm considering are Ensnaring Bridge , Norn's Annex is no longer consider
Azure Beastbinder A fairly strong card in Bloomburrow Limited, Azure Beastbinder is a great way to keep one of your opponents threats in check
It's great to see how an older, once-defunct ability can be repurposed to great success